MOBILE, Ala. -- Firefighters from Mobile, Ala., and U.S. Coast Guard crews are responding to explosions and a fire on two fuel barges in the Mobile River.

Mobile Fire and Rescue officials tweeted Wednesday night that two natural gas barges exploded and three people were hospitalized. Information on the extent of their injuries was not immediately available.

U.S. Coast Guard Petty Ofc. Carlos Vega said officials were on their way to the scene.

The cause of the explosion was not immediately clear.

The explosion comes two months after a Carnival cruise ship was towed to Mobile after becoming disabled during a February cruise by an engine room fire. The ship is still undergoing repairs there.